自诩聪明的人；好逞能的人 翻译成英语...smart aleck

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He was a smart aleck.
这里smart aleck或者smart alec并不是真正聪明的人。而是自以为聪明的人。

smart alec
smart alec (BrE) (NAmE smart aleck)  / ˈsmɑːt ælik; NAmE ˈsmɑːrt / (also 'smarty-pants) (BrE also 'smart-arse) (NAmE also 'smart-ass)

noun   (informal, disapproving)a person who thinks they are very clever and likes to show people this in an annoying way
   自诩聪明的人；好逞能的人

smart-alec
I. noun
see smart aleck
II. adjective
see smart-alecky


smart-alecky

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ADJECTIVE:Informal. Rude and disrespectful: assuming, assumptive, audacious, bold, boldfaced, brash, brazen, cheeky, contumelious, familiar, forward, impertinent, impudent, insolent, malapert, nervy, overconfident, pert, presuming, presumptuous, pushy, sassy, saucy, smart. Informal : brassy, flip, fresh, snippety, snippy, uppish, uppity. Slang : wise1. See ATTITUDE, COURTESY.

smart-al·ecky
\-kē, -ki\ adjective
or smart-aleck also smart-alec
: like, typical of, or being a smart aleck : marked by cockiness and conceit : concerned with or striving for smartness and cleverness for their own sake or at the expense of seriousness and responsibility
< had never talked that way to the smart-aleck kid before — J.H.Reese >
< the smart-aleck way you were talking — Alexander Saxton >
< dismayingly intelligent and a shade smart-alecky — Jean Stafford >
< five smart-alecky collegians who conspired to rob the till — Bennett Cerf >